20021122221102 has 128 divisors (see below), whose sum is σ = 46016759923200. Its totient is φ = 6448419548928.

The previous prime is 20021122221047. The next prime is 20021122221109. The reversal of 20021122221102 is 20112222112002.

It is a happy number.

20021122221102 is a `hidden beast` number, since 20 + 0 + 211 + 222 + 211 + 0 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021122221109) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 176097058 + ... + 176210714.

It is an arithmetic number, because the mean of its divisors is an integer number (359505936900).

Almost surely, 2^{20021122221102} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20021122221102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23008379961600).

20021122221102 is an abundant number, since it is smaller than the sum of its proper divisors (25995637702098).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20021122221102 is a wasteful number, since it uses less digits than its factorization.

20021122221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114527 (or 114521 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 20021122221102 its reverse (20112222112002), we get a palindrome (40133344333104).

The spelling of 20021122221102 in words is "twenty trillion, twenty-one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred two".